<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>第十七题</title>
    <script>
        var year = parseInt(prompt('请输入年份', 2000));
        if (year%100!=0 && year%4==0 || year%100==0 && year%400==0){
            alert(year + '年是闰年');
        } else {
            alert(year + '年不是闰年');
        }
    </script>
</head>
<body>
    
</body>
</html>